# strouhal number

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 February 25, 2008, 02:52 strouhal number #1 Deloat Guest   Posts: n/a Hi, Does anyone knows how to find the Strouhal number in Post-CFX? I am modelling constant flow past a cylinder, and wants to figure out the Strouhal number of that flow? Any ideas guys? Thanks a lot. Deloat

 February 25, 2008, 06:08 Re: strouhal number #2 andy20 Guest   Posts: n/a Just plot a chart of pressure behind the cylinder vs. time and estimate the period of the variation? Use that to compute the shedding frequency. I assume you know the radius and velocity already - so together that should allow you to compute the Strouhal number. I don't think there's much more to it.... (By the way be careful to account for the fact that with alternate vortex shedding from each side of the cylinder, the frequency of the drag force variation is twice that of the lift force variation...) Good luck, Andy Mehrez likes this.

 February 25, 2008, 07:02 Re: strouhal number #3 Rogerio Fernandes Brito Guest   Posts: n/a Trying using Origin 7.5 software to extract this frequency!

 February 25, 2008, 10:23 Re: strouhal number #4 Dre Guest   Posts: n/a What I do is plot the vorticity and set the scale so I can see the vortex better. Then I do an animation and export the frames as images. Then all I have to do is match 2 frames. Since my timesteps are constant, I have the time between two identical frames.

 February 27, 2008, 15:11 Re: strouhal number #5 pasu Guest   Posts: n/a I believe Strouhal number is only used when the flow is oscillatory. If you are modeling with constant flow then it wont help.

 March 11, 2008, 04:19 Re: strouhal number #6 wake Guest   Posts: n/a dear pasu But there is a defenition of strouhal number for constant flow also the frequency as vortex shedding frequency and diameter as length scale for a given velocity.

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